Dental casting-machine.



P. A. CARTER.

DENTAL CASTING mcnmn.

APPLICATION FILED JAN. 16, 1911.

1,036,563, Patented Aug. 27, 1912.

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1,036,563} 1 i i I Specification of Letters Patent.

,. DENTAL CASTING-MACHINE.

Application filed il 'anuary 16, 1911. Serial No. 602,780.

To all whom it mag concern: .Be it known that I, FRANCIS A. CARTER, a citizen of th'e'United -States of America, and resident of (Jhicago, Cook county, Illinois, have invented a certain new and useful 1m provement in Dental Casting-lllachines, of which the following is "a specification.

My invention relates to improvements in .dental casting machines, and. has for its obwhich will be more clearly understood loy reference to the accompanying drawings,'1n

which Figure'l represents a side elevation of my device partly in section. Fig. 2 is a crosssectionalwiew taken on line 2-2 of Fig. 1, looking in the direction indicated by the.

arrows.

Like reference characters indicate like parts in the several figures of the drawings.

Referring to Fig. 13 represents an investment flask which is filled with any suitable investment material 4 in which a wax mold has been absorbed in any well known manner, leaving a suitable mold 5 and a communicating sprue channel 6. The inlay material -7 is .placed within the flask over the sprue opening and melted in any desired manner. A cap 8 is adapted to be brought down so as to fit upon the top of the investment flask, the lower surface of this cap being provided with a suitable washer 9 of asbestos or other suitable material, so as to provide a tight fitting connect-ion when this cap is swung down upon the investment flask, in a manner to be hereinafter described. This cap is provided with a hollow interior, and passing through the upper portion of the same is a bent tube 10 through which air or other gas is adapted to be forced under pressure. A collar 11 surrounds this tube 10 and is screw mounted upon the cap 8, as clearly shown in the drawings. A packing 12 is interposed be tween the collar and the cap, and a spring 13 surrounds the .tube and is mounted upon I washer 14 and adapted to bear against the .inner face of the cap. The tube 10 terminates in an enlarged. receptacle 15 mounted 'within'the hollow interior of the cap, and

positioned so as to leave a clear space 16 between the outer walls of the enlargement and the inner wallsof the chamber. This Patented Aug.27, 1912. I

receptacle 15 is provided with a plurality of openings 17 placed circumferentially in its upper surface, by the medium'of which air forced under pressure through the tube 10 will be diffused within the chamber 16 and through the open end of the cap on to the melted metal placed in the top of the investment flask. A handle18 is provided, fastened to the tube 10,- whereby this cap can be raised and lowered at will. In the preferred construction, the tube 10 is pivoted at a suitable point, as at' 10, to assist in this raising and lowering operation.

In the operation of my device, the investment-flask is first-filled with the investment material, in whicha wax mold has been absorbed in any suitable manner, and the inlay material then placed over the sprue opening and melted in any desired manner. The cap is then swung down upon the tube of the investment flask and air or gas then admitted under pressure through the tube 10. This air is diffused through the openings 17, thus passing through the passage 16 and thence through the opening at the bottom of the cap onto the inlay material.

I find that by the use of this enlarged receptacle with the circumferential openings, which acts in the nature of a baflie plate, I obtain a much more perfect casting than when the air is allowed to impinge directly upon the inlay material, as with the use of,

this baffle plate the whole chamber 16 becomes filled with the air or gas under pressure and thus places a uniform' pressure upon the upper surface of the inlay material, which pressure forces the metal through the sprue channel into the mold.

What I claim as my invention is:

1. In a casting machine, an investment flask, a cap for said flask having an enlarged opening in the lower portion thereof, a tube passing through the upper part of said cap and terminating in an enlarged head in the opening of said cap, an open space between said head and the opening in said cap and surrounding said head, and

means for passing air or gas through said tube and cap and open space.

2. In a casting machine, an investment and ,means for passing air or gas through flask, a cap for said flask having an ensaid tube and cap. 10 larged opening in the lower portion thereof, Signed by me at Chicago, Ilhnois, this a tube passing through the upper part of 11th day of January, 1911.

5 said cap and terminating in an enlarged FRANCIS A. CARTER.-

head in-the opening of said cap, said head Witnesses: being closed at its end and provided with RUssELL KEARNS, circumferential openings on the side thereof, S. LEWIS. 1

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. G. 

